the front side of Urban Retreat
the back of a classic MtG card
the front side of Oboro Breezecaller
the back of a classic MtG card
the front side of Springheart Nantuko
the back of a classic MtG card
the front side of Earthcraft
the back of a classic MtG card
the front side of Scorched Ruins
the back of a classic MtG card

Color Identity: G, W, U

Initial Card State

  1.  Urban Retreat in hand.
  2.  All other permanents on the battlefield.

Easy Prerequisites

  1. You control a basic land.

Steps

  1. Activate Scorched Ruins by tapping it, adding one colorless manaone colorless manaone colorless manaone colorless mana.
  2. Activate Urban Retreat by paying two generic mana and returning a tapped creature you control from the battlefield to its owner's hand, putting Urban Retreat from your hand onto the battlefield.
  3. When Urban Retreat enters, Springheart Nantuko triggers. Choose not to pay and create a 1/1 Insect creature token.
  4. Activate Earthcraft by tapping the Insect, untapping a basic land you control.
  5. Activate the basic land by tapping it, adding one generic mana.
  6. Activate Oboro Breezecaller by paying two generic mana and returning Urban Retreat from the battlefield to your hand, untapping Scorched Ruins.
  7. Repeat.

Results

  1. Infinite creature ETB.
  2. Infinite creature LTB.
  3. Infinite colorless mana.
  4. Infinite landfall triggers.
  5. Infinite mana lands you control can produce.
  6. Infinite tapped creature tokens.
  7. Infinite untap of lands you control.
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